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The choke is coming off completely?
Does it matter if the engine is hot or cold?
Totally understand that!
What it sounds like is there is an issue with the vacuum advance on the distributor. If the diaphragm inside has a leak, or if the vacuum line to it isn't pulling vacuum then the timing won't advance and it will stall.
Also, check the butterfly for the choke. It's right up top of the carb, make sure when the engine is hot that it's open and not closed at all. It should be completely open. When the engine is cold, the butterfly should be closed a bit, but if its closed up to much, same problem. When you crack the throttle it will not get the right fuel mix and the thing will stall.
If I remember right there should be a vacuum T behind the carb and there should be a line from that going to the distributor. Make sure there aren't any vacuum leaks on that line.
Please let me know if there is any more I can do to help you from here.
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